Don, the EQ can improve the sound of the PA1000, but it cannot compete with the sound of the flagship model Pa4x. You get what you paid for.

Now when I think of your back problem the story changes. Here is where the PA1000 becomes a much better choice. Don’t mix apples and pears; it is either reaching for the better the sound or the NEED to have a keyboard that weighs less.

Hope this helps, John C.